I was using the Arduino UNO interrupts for the motor encoders when i started detecting an unexpected behaviour. Then i began searching for the problem and finally i ended up with just the Arduino UNO (no sensors, NOTHING connected). As explained in http://www.arduino.cc/en/Reference/AttachInterrupt the interrupts 0 and 1 correspond to ports 2 and 3 respectively. However this is not what i'm getting:
Pins 2, 3 and 4 respond to interrupt 0 (the one suposed to be attached to pin 0).
At the beginning i thought it could be due to some "internal short circuit / bad soldered pins" however after changing to another Arduino ONE board that I own i got the same result!!!
Is anybody getting this behavior as well?